1
general::
noun extra item ADJ. essential, perfect, useful This silk scarf is the perfect accessory for stylish summer evenings. | bathroom, car, fashion person who helps in crime PREP. ~ to an accessory to murder PHRASES an accessory before/after the fact (= a person who knows about a crime before/after it was committed and protects the criminal) (law) If you were lying to the police, then you have been an accessory after the fact for all these years.
Oxford Collocations Dictionary